JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Xiaona Wu,Lei Yang,Fanbin Meng,Wenli Shao,Xiang Liu,Miao Li
The incorporation of functional nanomaterials is a promising technique to enhance or develop novel material properties, such as improvement of permeability and selectivity related to water purification and reuse. Herein, ZIF-8 nanoparticles were used to prepare the thin-film nanocomposite (TFN) membranes via both two-step in situ growth and one-step blending interfacial polymerization (IP) methods. The primary purpose was to investigate specific effects of different preparation methods and ZIF-8 nanoparticles on the structure and properties of TFN membranes. The results show that ZIF-8 nanoparticles increased the negative charge, roughness, and hydrophilicity of the polyamide rejection layer. The effects of one-step blending method on the TFN membrane characteristics were limited as compared to the two-step in situ growth method. The effective incorporation of ZIF-8 nanoparticles into TFN membranes increased the water permeability of TFN-ZIF-0.64 to 20.8 ± 0.62 L·m −2 ·h −1 ·bar −1 and enhanced the Na 2 SO 4 rejection to 94.2 ± 3.4%, which is approximately 1.3 times increase in water permeability and 8.0% rise in rejection than those of TFC membrane. Comparatively, two-step in situ growth ZIF-8-modified TFN membranes displayed ultrahigh rejection of typical anionic dyes, demonstrating superior NF performance.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 48
·21183-21191
·
IF 3.288
Pengyao Yu,Sheng Liu,Yuchen Cui,Kun Sun,Ling Zhang,Hailing Guo,Yongming Chai,Chenguang Liu,Lili Fan,Ge Yang,Chunzheng Wang,Svetlana Mintova
A uniform bimetallic hollow ZnFe–N/C (80–180 nm) electrocatalyst is synthesized using a precursor ZnFe-ZIF-8 (100–200 nm) subjected to pyrolysis in an argon atmosphere at 800 °C for 2 hours. The ZnFe–N/C catalyst was deposited on a glassy carbon electrode (GCE), and exhibited a superior electrocatalytic activity with a high onset potential (0.97 V vs. RHE) and half-wave potential (0.85 V vs. RHE), high stability in an alkaline electrolyte, and remarkable resistance to methanol. The high performance of the ZnFe–N/C-3 electrocatalyst is attributed to the hollow structure containing metallic Fe/Fe3C and N doping.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Eryue Song,Kaifeng Wei,Haiqian Lian,Jingxian Hua,Hongxu Tao,Tingting Wu,Yichang Pan,Weihong Xing
Metal-organic frameworks (MOFs) used as molecular sieve membranes materials to gas separation has attracted much attention. However, the separation performance was also limited by its intrinsic flexibility of frameworks. Controlling its flexibility is still a big challenge. Herein, the doping of 2-aminobenzimidazole (ambz) into the ZIF-8 framework can obviously improve its original rigidity, which is due to the improved rigidity of the Zn‒N bond. Correspondingly, the high-quality doped ZIF-8 membrane for effective separation of C 3 H 6 /C 3 H 8 mixture were also fabricated. Compared with the permeation results on pure ZIF-8 membranes, the ambz-doped ZIF-8 membrane exhibited two specific transportation performance improvements. The first was that drop extent of C 3 H 6 /C 3 H 8 selectivity on the doped ZIF-8 membrane with the increase in feeding pressure was decreased, and the selectivity was also irreversible as the feeding pressure was released. This phenomenon was attributed to improved rigidity of the framework. The second was that the C 3 H 6 permeance was almost independent on the permeating temperature, which was also totally different with that on the pure ZIF-8 membrane, resulting from the significant change of adsorptive heat and diffusion energy of propylene on the ambz-doped ZIF-8 membrane. Therefore, this ambz-doped ZIF-8 membrane is promising in real world C 3 H 6 /C 3 H 8 separation.
✓ 已验证
产品关联
DOI
高影响因子
Applied Nanoscience
·
2020
·Vol. 10
·期 5
·1409-1419
·
IF 2.88
Ge Bo,Yang Hang,Xu Xiaochen,Ren Guina,Zhao Xingchuan,Pu Xipeng,Li Wenzhi
How to efficiently treat dissolved and insoluble pollutants in water is a difficult problem. In the presence of ZIF-8 and BiOBr, superhydrophobic aerogel with oil/water separation and photodegradation performance was prepared by simply dipping the functional composite material in the support surface of the melamine sponge. The problem of surface oil pollution can be solved using its superhydrophobicity and superoleophilicity. The existence of BiOBr in aerogels makes it possible for the pollutants dissolved in water to degrade under light irradiation. The band gap width of BiOBr ( E g = 2.6 eV) and the density of the photogenerated carriers (5.21 × 10 23 cm −3 ) were determined by DRS and the Mott–Schottky curve, respectively. The positions of the valence band (2.97 eV) and conduction band (0.37 eV) were confirmed by theoretical calculation. The robustness between the functional coating and the substrate was ensured through 4000 friction (1.06 × 10 5 Pa) and 100 compression tests, which shows good mechanical stability of the material. This study is expected to provide a new way of thinking with regard to water pollution treatment and material multi-function.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Magnesium and Alloys
·
2021
·
IF 10.088
Shiquan Jiang,Zhiyuan Zhang,Dong Wang,Yuqing Wen,Ning Peng,Wei Shang
Mg alloys are considered the most promising engineering materials because of their unique properties. However, the uncontrolled corrosion rate of these alloys limits their applications. Therefore, in this study, a micro-arc oxidation layer was used as a transition layer to “directly” grow a zinc-based metal-organic framework (MOF) composite coating on the surface of a Mg alloy (AZ91D). Herein, the two zeolitic imidazolate framework (ZIF-8) coatings with different morphologies were separately prepared by homologous metal oxide induction and a one-step in-situ growth method. The superhydrophobic composite coating showed strong hydrophobicity and self-cleaning properties, which could prevent the penetration of water and corrosive ions (Cl − ) into the surface of AZ91D. Electrochemical tests demonstrated that the super-hydrophobic composite coatings greatly enhanced the corrosion resistance of AZ91D, and the corrosion current density decreased from 10 −5 to 10 −9 A/cm 2 . These results indicate that the ZIF-8 coatings are beneficial for improving the hydrophobicity and enhancing the corrosion resistance of Mg alloys. Therefore, MOF composite coatings provide a new strategy that can be used to prepare multifunctional anticorrosion coatings on metal substrates.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xuefang Chen,Xiuyun An,Lizhen Tang,Tianwei Chen,Guanhua Zhang
Exploring high efficient electrocatalyst for hydrogen evolution reaction plays a vital role in the sustainable and widespread application of hydrogen fuel. Platinum-based electrocatalysts, as one of the most standout candidates, are limited to large-scale commercial applications attributing to their scarcity, expensive price, poor stability, and inferior durability. Herein, we construct a ZIF-8-derived nitrogen-doped carbon arrays-confined platinum clusters structure, named CTA@Pt@NCBs, on a continuously conducting carbon nanotube arrays substrate. As expected, the prepared CTAs@Pt@NCBs exhibits a low overpotential of 27.42 mV at 10 mA cm −2 . More importantly, CTA@Pt@NCBs demonstrate excellent stability and durability, with 97.18% potential retention after 60 h of chronopotentiometric test, higher than that of commercial Pt/C (53.09%), and virtually no decrease in activity after 10, 000 potential cycles. The excellent electrocatalytic performance is mainly attributed to the unique structural features, including confined Pt clusters, porous nitrogen-doped carbon bubbles, continuous conductive carbon nanotube arrays, and binder-free electrode. This work provides a feasible strategy for improving the stability and atom utilization efficiency of platinum-based catalysts, thereby increasing their cost-effectiveness.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2021
·
IF 5.03
Dongyue Liu,Yihua Cui,Tianlong Zhang,Wenhua Zhao,Pengfei Ji
The introduction of traditional flame retardants into epoxy resins (EP) usually generated a number of harmful smoke during burning. A novel flame retardant ( d ZIF-8) was synthesized via functionalization of zeolitic imidazolate frameworks-8 by 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide derivatives (DMZ). The flame retardancy and smoke suppression of the d ZIF-8 modified EP were studied. The combustion results showed that d ZIF-8 can effectively reduce the fire risk of EP. Compared with the neat EP, the value of peak heat release rate (PHRR), the total smoke release rate (TSRR) and the maximum smoke density of the EP containing 2% d ZIF-8 were decreased by 51%, 47% and 36%, respectively. The TG-FTIR results showed that the production of the pyrolysis gaseous products was inhibited by d ZIF-8 during the decomposition of EP. In addition, the synergistic effect between the DMZ and the zeolitic imidazolate frameworks-8 improved the flame retardancy of the EP. Meanwhile, the increase in the flame-retardant performance of the d ZIF-8 modified EP was caused by the quenching effect of the free radical containing phosphorus in gas phase and the charring effect of pyrophosphoric acid and zinc oxide in condensed phase. The morphology of d ZIF-8 crystal changed from granular to laminar, indicating that the introduction of DMZ affected the crystal growth of d ZIF-8. The laminar structure of the d ZIF-8 provided a layered barrier effect during the burning process of EP.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2019
·
IF 0
Bin Yang,Xueyao Ding,Meiyun Zhang,Lin Wang,Xu Huang
A feasible strategy by incorporation of zeolitic imidazolate framework-8 (ZIF-8) nanocrystals on aramid nanofibers (ANFs) to prepare a flexible, strong, water-resistant ZIF-8/ANFs composite nanopaper with excellent gas adsorption capacity and good thermal stability was proposed. The morphologies, bonding behaviors between ZIF-8 and ANFs, gas adsorption capacity, thermal stability, mechanical properties and water resistance of the composite nanopaper were investigated. The result shows that the in situ synthesis of ZIF-8 nanocrystals in ANFs/DMSO solution could improve the bonding states and distribution homogeneity of ZIF-8 nanocrystals. The flexible ZIF-8/ANFs composite nanopaper exhibits excellent adsorption capability (specific surface area of 246.2 m 2 /g, total pore volumes of 0.106 cm 3 /g and 79.1 cm 3 /g of nitrogen adsorption quantity at relative pressure of 0.55), favorable water resistance (remains tensile strength after soaking in water for 48 h), impressive thermal stability (initial decomposition temperature of 485 °C), which is beneficial to broaden the application of ANFs in gas adsorption and separation field used in harsh conditions such as high temperature and humid environment.
✓ 已验证
产品关联
DOI
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2019
·Vol. 95
·期 3
·730-738
·
IF 2.659
Yating Wang,Xu Li,Xiu Dai,Yixing Zhan,Xiaoqing Ding,Ming Wang,Xinglong Wang
BACKGROUND With the rapid industrial and urbanization development, a large amount of oily wastewater is generated from various sources. It is mutagenic and carcinogenic to human health and seriously affects the ecosystem. In this study PLA/ZIF-8@C600 nanofibers were prepared for oil adsorption. RESULTS Hybrid nanoparticles (ZIF-8@C600) of carbon black C600 and zeolitic imidazolate framework-8 (ZIF-8) with high specific surface area and porous structure were prepared by co-deposition and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FITR) spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and contact angle measurement. Biodegradable composite nanofiber membranes of poly(lactic acid) (PLA) and ZIF-8@C600 were manufactured by electrospinning. The SEM and contact angle results showed that the addition of ZIF-8@C600 could adjust the diameter, porosity, pore size and hydrophobicity of the composite electrospun nanofibers. The PLA/ZIF-8@C600 porous membranes had good oil sorption properties in oil–water mixture and emulsion. The oil adsorption capacity of the sample with 1 wt% ZIF-8@C600 was improved by ∼72.59% compared with that of pure PLA (13.5 g g −1 ), which demonstrated that the PLA/ZIF-8@C600 fibers were good candidates as oil sorbents. The adsorption kinetics of the membranes on paraffin liquid was in accordance with pseudo-second-order kinetics. CONCLUSION The addition of hybrid ZIF-8@C600 improved the hydrophobic properties and oil adsorption capacity of PLA/ZIF-8@C600 porous membranes. Because PLA is an environmentally friendly polymer, composite membranes based on it can avoid secondary pollution. Overall, these findings have good prospects for future treatment of oily wastewater. © 2019 Society of Chemical Industry
✓ 已验证
产品关联
DOI
高影响因子
BIOTECHNOLOGY LETTERS
·
2019
·Vol. 42
·期 2
·269-276
·
IF 2.154
Cai Xinyong,Zhang Mengjie,Wei Wei,Zhang Yinjun,Wang Zhao,Zheng Jianyong
A novel enzyme immobilization method employing metal–organic framework (MOF) encapsulation and macroporous resin adsorption was developed in this study. Candida antarctica lipase B (CALB) was firstly encapsulated onto metal–organic frame structures (Zeolitic imidazole framework-8, ZIF-8) and further bonded to macroporous resin by physical adsorption. Under optimized immobilization conditions, the activity of the prepared immobilized lipase (CALB-ZIF-8@D101) determined via the methyl esterification of oleic acid was 38.4 U/mg. Compared with free lipase, the immobilized lipase exhibited improved thermal and operational stability and organic solvent tolerance. These results demonstrate that the immobilization method of ZIF-8 encapsulation and macroporous resin adsorption enhanced enzyme properties at a superior level.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Yaru Chu,Feng Gao,Fei Gao,Qingxiang Wang
The zeolitic imidazolate framework ZIF-8 was synthesized and mixed with chitosan (CS) solution to obtain a homogeneous dispersion. Then the dispersion of ZIF-8 and CS (ZIF-8-CS) modified glassy carbon electrode is fabricated and utilized for stripping voltammetric analysis of Hg 2+ , Cu 2+ , Pb 2+ and Cd 2+ for the first time. The large surface area effect and strong enriching effect of the nanosized ZIF-8 to the four heavy metal ions contribute to significantly enhance analytical signals. Under the optimum conditions, the stripping peak current densities linearly increased with Hg 2+ concentration in the range from 1.0 μM to 80.0 μM, and with Cu 2+ , Pb 2+ and Cd 2+ concentrations in the range from 1.0 μM to 100.0 μM. The analytical sensitivity for the four ions are estimated to be 14.20 μA·μM −1 ·cm −2 (Hg 2+ ), 2.797 μA·μM −1 ·cm −2 (Cu 2+ ), 5.203 μA·μM −1 ·cm −2 (Pb 2+ ) and 1.390 μA·μM −1 ·cm −2 (Cd 2+ ), respectively. The limits of detection for the four ions were estimated to be 0.0293 μM (Hg 2+ ), 0.108 μM (Cu 2+ ), 0.0619 μM (Pb 2+ ) and 0.135 μM (Cd 2+ ), respectively. The ZIF-8 based modified electrode also presented excellent anti-interference ability, and good reliability for monitoring the four ions in real water samples.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Tie Gao,Zhenzhen Liu,Haibo Li
Heteroatom doped carbonaceous material has attracted enormous attentions in electrochemical research community due to the replacement of some carbon atoms in the carbon skeleton result in charge redistribution and thus the modification of physiochemical properties. In this work, we proposed a facial approach to synthesize nitrogen and titanium co-doped hierarchical mesoporous carbon ((N, Ti)-HMCs) by employing ZIF-8 as procures for capacitive deionization (CDI) with enhanced performance. The as-prepared (N, Ti)-HMCs exhibits novel cubic structure, high doping content and high specific surface area of 1025.93 m 2 /g. The Raman spectra revealed the presence of abundant structural defects in (N, Ti)-HMCs rather than HMCs which is beneficial to promote the electrosorption. Besides, the electrochemical analysis demonstrated that (N, Ti)-HMCs owns improved specific capacitance and lower resistivity as compared to that of HMCs. Moreover, by examining the CDI performance of (N, Ti)-HMCs in a batch mode experiment, it illustrated high salt removal capacity of 13.89 mg/g at 1.2 V in a 500 mg/L NaCl solutions and outstanding adsorption rate of 3.53 mg/(g·min). Thus, (N, Ti)-HMCs should be proposed as superior electrode materials for enhanced CDI. Our work also strengthens the emphasis on heteroatom doped carbonaceous materials in CDI.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）